Reactive Power Inside the Network 

Reactive power is the alternating component of electrical power and is generally undesirable or should be kept as low as possible. The alternating component always reverses its direction (sign, positive to negative to positive, etc.) since this power oscillates back and forth between the consumer and the energy source. For purely resistive loads (electrical resistance), the angle φ is zero and thus the reactive power is also zero. However, this is different for inductive consumers (electric coil) and capacitive consumers (electric capacitors), since electric voltage is fed back into the grid. Capacitive and inductive consumers differ only in the respect that the phase shift happens in different directions (the result remains the same).

SEO= Calculate single-phase motors!